Arduino ledOn-1

Make sure to change the UNIT1 variable to reflect the correct tty...

#!/bin/bash -e
# by Roland Latour, Feb.2008, GPLv2, see 'man gpl'

UNIT1=/dev/tty.usbserial-A6004osu
if [ -e $UNIT1 ]; then
# send the command
   /bin/echo -e -n "w d 13 1\n" > $UNIT1
else
   /bin/echo "Unit 1 not plugged in."
fi

# set up similar aliases for the other IO pins, when you name those pins